<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图-->
        <el-card>
            <el-row>
                <el-col :span="4">
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!--表格-->
            <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false"
            :expand-type="false" show-index index-text="#" border :show-row-hover="false">
                <!--是否有效-->
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" style="color: lightgreen;" v-if="scope.row.cat_deleted === false"></i>
                    <i class="el-icon-error" style="color: red;" v-else></i>
                </template>
                <!--排序-->
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                    <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                    <el-tag size="mini" type="warning" v-else>三级</el-tag>
                </template>
                <template slot="opt" slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.cat_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteCate(scope.row.cat_id)">删除</el-button>
                </template>
            </tree-table>
            <!--分页区域-->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="queryInfo.pagenum"
                :page-sizes="[5, 10, 15, 20]"
                :page-size="queryInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total">
            </el-pagination>
        </el-card>
        <!--添加分类对话框-->
        <el-dialog title="添加分类"
            :visible.sync="addDialogVisible"
            width="50%" 
            @close="setAddDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="addForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类">
                    <el-cascader
                        v-model="selectedKeys"
                        :options="parentCateList"
                        :props="casCaderProps"
                        @change="parentCateChanged" clearable
                        change-on-select="true">
                    </el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取消</el-button>
                <el-button type="primary" @click="addCateInfo">确定</el-button>
            </span>
        </el-dialog>
        <!--修改分类对话框-->
        <el-dialog title="修改分类"
            :visible.sync="editDialogVisible"
            width="50%" 
            @close="setEditDialogClosed">
            <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="80px">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="editForm.cat_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取消</el-button>
                <el-button type="primary" @click="editCateInfo">确定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            queryInfo: {
                type: [],
                pagenum: 1,
                pagesize: 5
            },
            addDialogVisible: false,
            editDialogVisible: false,
            // 商品分类的数据列表,默认为空
            catelist: [],
            // 总数据条数
            total: 0,
            // 为table指定列的定义
            columns: [
                {
                    label: '分类名称',
                    prop: 'cat_name'
                },
                {
                    label: '是否有效',
                    type: 'template',// 将当前列定义为模板列
                    template: 'isok'// 模版列名称
                },
                {
                    label: '排序',
                    type: 'template',
                    template: 'order'
                },
                {
                    label: '操作',
                    type: 'template',
                    template: 'opt'
                }
            ],
            addForm: {
                cat_name: '',
                cat_pid: 0,
                cat_level: 0// 默认添加的分类等级是一级
            },
            addFormRules: {
                cat_name: [
                    {required: true, message: '请输入分类名称', trigger: 'blur'},
                    {min: 3, max: 10, message: '分类名称的长度在3到10个字符之间', tigger: 'blur'}
                ]
            },
            parentCateList: [],
            casCaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 选中的父级分类的id数组
            selectedKeys: [],
            editForm: {}
        }
    },
    created(){
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const {data: res} = await this.$http.get('categories', {params: this.queryInfo})
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }else{
                this.$message.success('获取商品分类成功')
                this.catelist = res.data.result
                this.total = res.data.total
            }
        },
        // 监听pagesize改变
        handleSizeChange(newsize){
            this.queryInfo.pagesize = newsize
            this.getCateList()
        },
        // 监听pagenum改变
        handleCurrentChange(newpage){
            this.queryInfo.pagenum = newpage
            this.getCateList()
        },
        // 添加分类对话框
        showAddCateDialog(){
            this.getParentCateList()
            this.addDialogVisible = true
        },
        setAddDialogClosed(){
            this.$refs.addFormRef.resetFields()
            this.selectedKeys = []
            this.addForm.cat_level = 0
            this.addForm.cat_pid = 0
            this.addDialogVisible = false
        },
        async getParentCateList(){
            // 获取父级分类的数据列表
            const {data: res} = await this.$http.get('categories', {params: {
                type: 2
            }})
            if(res.meta.status !== 200){
                return this.$message.error('获取父级分类数据失败')
            }else{
                this.$message.success('获取父级分类数据成功')
                this.parentCateList = res.data
            }
        },
        parentCateChanged(){
            if(this.selectedKeys.length > 0){
                this.addForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1]
                this.addForm.cat_level = this.selectedKeys.length
            }else{
                this.addForm.cat_pid = 0
                this.addForm.cat_level = 0
            }
        },
        addCateInfo(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const {data: res} = await this.$http.post('categories', this.addForm)
                if(res.meta.status !== 201){
                    return this.$message.error('添加分类失败')
                }else{
                    this.$message.success('添加分类成功')
                    this.getCateList()
                    this.addDialogVisible = false
                }
            })
        },
        async showEditDialog(id){
            const {data: res} = await this.$http.get('categories/'+id)
            if(res.meta.status !== 200){
                return this.$message.error('查询分类信息失败')
            }else{
                this.$message.success('查询分类信息成功')
                this.editForm = res.data
                this.editDialogVisible = true
            }
        },
        setEditDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        editCateInfo(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid){
                    return
                }else{
                    const {data: res} = await this.$http.put('categories/'+this.editForm.cat_id, 
                    {
                        cat_name: this.editForm.cat_name
                    })
                    if(res.meta.status !== 200){
                        return this.$message.error(res.meta.msg)
                    }else{
                        this.$message.success('修改分类信息成功')
                        this.getCateList()
                        this.editDialogVisible = false 
                    }
                }
            })
        },
        async deleteCate(id){
            const confirmResult = await this.$confirm('此操作将永久删除该分类，是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err);
            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除')
            }
            const {data: res} = await this.$http.delete('categories/'+id)
            if(res.meta.status !== 200){
                return this.$message.error(res.meta.msg)
            }{
                this.$message.success('删除分类信息成功')
                this.getCateList()
            }
        }
    }
}
</script>

<style lang="less" scoped>
    .treeTable{
        margin-top: 15px;
    }

    .el-cascader{
        width: 100%;
    }
</style>